Which of these aliens most deserves their own book from Decipher? I am not including Klingons because a Klingon book is planned. I guess they could do a big book with about twenty pages for each Player Guide race. An Aliens volume two the same size as volume one with the same number of races could pretty much wrap up all the races that would logically be considered most important. I came up with a list that seems to cover most of the ones that would reasonably be considered most important plus a few extras, and there's room for more.
Acamarians
Artelines
Ba'ku
Bandi
Baneans
Cairn
Chameloids
Cherons
Cytherians
Debrune
Denobulans
Dopterians
Dosi
Douwd
Excalbians
Exocomps
Ferengi
Haakonians
Harelians
Hupyrians
Hur'q
Iconians
Karemmans
Klaestrons
Krenim
Kriosians
Lorillians
Magna Romans
Melkots
Menthar
Metrons
Mintakans
Myleans
Nagillum
Novans
Organians
Othans
Palmans
Promellians
Pselliads
R'akaa
Remans
Rigellians
Sheliak
Son'a
Talarians
Tamarians
Taurhai
Terabians
Tkon
Tzenkethi
Vapulans
Voth
Wadi
Xindi
Zalkonians